I needed to delete a couple of folders. I deleted 2 of them, accidentally deleted a file I was not going to, went to the bin, restored the file, went back to deleting the folders, finished it, decided to check up the bin for any other files I could unintentionally delete. I opened the bin and right in front my eyes some folders and files deleted both previously and just a few moments before opening the bin disappear from it. HDD is not even nearly full. I did not delete the files with shift key or anything else that could lead to files not ending in the recycle bin.
Does Windows OS empty the bin automatically? Have not witnessed such behavior in all the years. The size of all files inside it was far less 100gb, and I had had 200 and 300 gb in the bin before without any problem.
Could not find anything useful anywhere, except this question and this one, which are only a little similar.